From 5b884403a15139645363d95c970ce1a6d875217a Mon Sep 17 00:00:00 2001
From: jun-low <zhijun.low@gmail.com>
Date: Sun, 4 Oct 2020 20:45:05 +0800
Subject: [PATCH] Create isDuplicates.md

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 snippets/isDuplicates.md | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 snippets/isDuplicates.md

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+---
+title: isDuplicates
+tags: array,intermediate
+---
+
+Check if there's duplicate values in a flat array.
+
+- Convert original array into a Set.
+- The `.size()` returns the number of (unique) elements in a Set object.
+- Compare the lengths of the array and the Set.
+
+
+```js
+function isDuplicates(array) {
+  return new Set(array).size !== array.length
+}
+```
+
+```js
+isDuplicates([0,1,1,2]); // 'True'
+isDuplicates([0,1,2,3,]); // 'False'
+```